Merge pull request #275 from stefanbeller/master

Spritepacking: convert the triggered bear trap animation.
Merge pull request #276 from stefanbeller/master

Completing all 'normal' minicore images
Minicore: remove 'head_hood' files.

This was renamed in fantasycore in 847ea8ab0661d3f885dcddee01703ca1a54c7429
Add noalpha versions for minicore preview graphics
Add missing noalpha preview graphics for fantasycore